CustomElements: taking CustomElementReactionStack out of frameHost

third_party/WebKit/Source/core/dom/custom/CustomElementReactionStack.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CustomElementReactionStack_h
 #define CustomElementReactionStack_h
 
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
@@ skipping 11 matching lines @@
 public:
     CustomElementReactionStack();
 
     DECLARE_TRACE();
 
     void push();
     void popInvokingReactions();
     void enqueueToCurrentQueue(Element*, CustomElementReaction*);
     void enqueueToBackupQueue(Element*, CustomElementReaction*);
 
+    static CustomElementReactionStack& current();
+
 private:
     using ElementReactionQueueMap =
         HeapHashMap<Member<Element>, Member<CustomElementReactionQueue>>;
     ElementReactionQueueMap m_map;
 
     using ElementQueue = HeapVector<Member<Element>, 1>;
     HeapVector<Member<ElementQueue>> m_stack;
     Member<ElementQueue> m_backupQueue;
 
     void invokeBackupQueue();
     void invokeReactions(ElementQueue&);
     void enqueue(Member<ElementQueue>&, Element*, CustomElementReaction*);
 };
 
 } // namespace blink
 
 #endif // CustomElementReactionStack_h